narrowness vs restriction

narrowness and restriction both are nouns.

Word	Noun	Adjective	Verb	Adverb
narrowness	Yes	No	No	No
restriction	Yes	No	No	No

As nouns, restriction is a hypernym of narrowness; that is, restriction is a word with a broader meaning than narrowness:

Other hypernyms of narrowness include limitation.

narrowness (noun)	restriction (noun)
the property of being narrow; having little width	an act of limiting or restricting (as by regulation)
a small margin	the act of keeping something within specified bounds (by force if necessary)
an inclination to criticize opposing opinions or shocking behavior	a principle that limits the extent of something
a restriction of range or scope